Page 94
45-J Desel - Servce & Parts Manual
January 2022
Secton 18 - Mechancal Components
General Troubleshooting Tips
Hydraulic Fluid Pump
The hydraulic Drive Pump and Primary Functions Pump used in this model are variable displacement,
axial piston type pumps. Proper adjustment is critical for normal operation of the machine. Refer to
Section 10 - Hydraulic System of this manual.
The Secondary Functions pump is a fixed-displacement gear-type pump attached to the rear of the
Primary Functions Pump.
Common Causes of Electrical System Malfunctions:
Battery connections are loose or corroded
Battery is not fully charged.
Emergency Stop buttons are pushed (OFF position).
Circuit breaker is tripped (OFF position).
Common Causes of Hydraulic System Malfunctions:
Hydraulic fluid level is too low.
Incompatible hydraulic fluids mixed, destroying the additives and causing varnish build up,
resulting in the valves sticking.
Water in the hydraulic fluid due to a damp climate.
Improper hydraulic fluid used. Viscosity too high in cold climates. Viscosity too low in warm
climates.
Hydraulic fluid contaminated with debris - filter change interval neglected.
Note:
MEC uses a multiple viscosity fluid that is light enough for cold climates and resists thinning in
warm climates. Use only the recommended hydraulic fluid. Substituting a lower grade fluid will
cause the machine to operate incorrectly and may lead to pump and drive motor failure. Refer
to “Lubrication” in Section 10 of this manual.
Note:
Contamination always causes failure in any hydraulic system. It is very important to be careful
not to introduce any contamination into hydraulic system during the assembly procedures.
Make sure all ports and cavities of the manifold and cylinders are properly covered/plugged
during maintenance activities.
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